Mercedesstar
Active Member
- Joined
- May 1, 2012
- Messages
- 105
- Car
- S320Cdi
Hi all
My engine, in a 1999 E320CDI, has over some time developed a metallic clacking noise, is the only way I can describe it. It is getting worse, and the engine has startet to idle rough as well, jumpy and rough. I hoped it had to do with the engine mounts, or certainly the clacking noise. But having changed the engine and gearbox mounts it seems to have got worse. It is only there during mild acceleration, accelerate slightly harder and the clacking goes away. It does not affect the performance of the engine, it runs perfectly otherwise, it starts on the button, oil is fine and fuel consumption is normal. The clacking noise and jumpy idle is only there when the engine gets warm. But at its worse it really does sound bad, clacking metallic noise is the only way to describe it. I left the engine running when I came home this afternoon and lifted the bonnet, trying to rev the engine from the engine bay does not give the clacking noise, so only under load. Gearbox is smooth, changes fine. When I lifted the bonnet the engine was visibly running jumpy.
It has got full service historie, had a new speed sensor last year with the service, I change oil between services, so every 3-5000 miles. It has got 135000 miles on it.
Any suggestions.
Thank you in advance
My engine, in a 1999 E320CDI, has over some time developed a metallic clacking noise, is the only way I can describe it. It is getting worse, and the engine has startet to idle rough as well, jumpy and rough. I hoped it had to do with the engine mounts, or certainly the clacking noise. But having changed the engine and gearbox mounts it seems to have got worse. It is only there during mild acceleration, accelerate slightly harder and the clacking goes away. It does not affect the performance of the engine, it runs perfectly otherwise, it starts on the button, oil is fine and fuel consumption is normal. The clacking noise and jumpy idle is only there when the engine gets warm. But at its worse it really does sound bad, clacking metallic noise is the only way to describe it. I left the engine running when I came home this afternoon and lifted the bonnet, trying to rev the engine from the engine bay does not give the clacking noise, so only under load. Gearbox is smooth, changes fine. When I lifted the bonnet the engine was visibly running jumpy.
It has got full service historie, had a new speed sensor last year with the service, I change oil between services, so every 3-5000 miles. It has got 135000 miles on it.
Any suggestions.
Thank you in advance